<template>
  <div class="app-container">
    <span v-if="this.$route.params.id != null">修改讲师</span>
    <span v-else>添加讲师</span>
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" />
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number
          v-model="teacher.sort"
          controls-position="right"
          :min="0"
        />
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师" />
          <el-option :value="2" label="首席讲师" />
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" />
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea" />
      </el-form-item>

      <!-- 讲师头像：TODO -->
      <el-form-item label="讲师头像">
        <!-- 头衔缩略图 -->
        <pan-thumb :image="teacher.avatar" />
        <!-- 文件上传按钮 -->
        <el-button
          type="primary"
          icon="el-icon-upload"
          @click="imagecropperShow = true"
          >更换头像
        </el-button>

        <!--
  v-show：是否显示上传组件
  :key：类似于id，如果一个页面多个图片上传控件，可以做区分
  :url：后台上传的url地址
  @close：关闭上传组件
  @crop-upload-success：上传成功后的回调 -->
        <image-cropper
          v-show="imagecropperShow"
          :width="300"
          :height="300"
          :key="imagecropperKey"
          :url="BASE_API + '/eduoss/fileoss'"
          field="file"
          @close="close"
          @crop-upload-success="cropSuccess"
        />
      </el-form-item>

      <el-form-item>
        <el-button
          :disabled="saveBtnDisabled"
          type="primary"
          @click="saveOrUpdate"
          >保存</el-button
        >
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import teacherApi from "@/api/edu/teacher";
// 引入上传头像组件模块
import ImageCropper from '@/components/ImageCropper'
import PanThumb from '@/components/PanThumb'

export default {
  //声明上传头像组件
  components: {ImageCropper,PanThumb},
  data() {
    return {
      teacher: {
        name: "",
        sort: 0,
        level: 1,
        career: "",
        intro: "",
        avatar: "https://edu-young160.oss-cn-beijing.aliyuncs.com/2021/08/12/avatar.jpg",
      },
      //上传组件弹框是否显示
      imagecropperShow: false,
      //获取dev.env.js中的地址
      BASE_API: process.env.BASE_API,
      //上传组件的唯一标识
      imagecropperKey: 0,
      //点击之后保存按钮是否禁用
      saveBtnDisabled: false,
    };
  },
  created() {
    this.init();
  },
  watch: {
    //监听
    $route(to, from) {
      //路由变化方式，路由发生变化，方法就会执行
      this.init();
    },
  },
  methods: {
    close() {//关闭上传弹框方法
      this.imagecropperShow = false;
      this.imagecropperKey += 1
    },
    cropSuccess(data) {//上传弹框中保存按钮方法
    this.imagecropperShow = false
    this.teacher.avatar = data.url
    this.imagecropperKey += 1
    },
    init() {
      //判断路径中是否有id
      if (this.$route.params && this.$route.params.id) {
        //从路径获取id
        const id = this.$route.params.id;
        //调用查询方法
        this.getInfo(id);
      } else {
        /**
         * 若没有id，说明是添加操作
         * 修复点击修改后，再点击到添加
         * 页面，回显数据仍然会存在的问题
         */
        this.teacher = {};
      }
    },
    //根据讲师id查询
    getInfo(id) {
      teacherApi.getTeacherInfo(id).then((res) => {
        this.teacher = res.data.item;
      });
    },
    saveOrUpdate() {
      if (this.$route.params.id != null) {
        this.updateTeacher();
      } else {
        this.saveTeacher();
      }
    },
    //修改讲师
    updateTeacher() {
      teacherApi.updateTeacher(this.teacher).then(() => {
        //提示信息
        this.$message({
          type: "success",
          message: "修改成功!",
        });
        //回到列表
        this.$router.push({ path: "/teacher/table" });
      });
    },
    //添加讲师
    saveTeacher() {
      teacherApi.addTeacher(this.teacher).then(() => {
        //提示信息
        this.$message({
          type: "success",
          message: "添加成功!",
        });
        //回到列表
        this.$router.push({ path: "/teacher/table" });
      });
    },
  },
};
</script>